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Temperature scales

The three temperature scales

Absolute zero Water freezes Body temp Water boils
Fahrenheit −460 32 98.6 212
Celsius -273 0 37 100
Kelvin 0 273 310 373


How do remember what the temperature means using the metric system?

Thirty is hot               Twenty is nice         Ten is cool                 Zero is ice


Devices that measure temperature are called thermometers. 

There are thermometers to measure your body temperature, oven temperature, and even the temperature of liquid oxygen.

Fahrenheit is the classic English system

Water freezes at 32 degrees Fahrenheit and boils at 212 degrees.

The scale was created by Gabriel Daniel Fahrenheit, a German scientist, in 1724.

It divides the difference between the boiling point and freezing point of water into 180 degrees, of equal size.

To convert temperatures from Fahrenheit to Celsius:
( Fahrenheit – 32 ) x 5/9 = Celsius.

Celsius is the modern, metric system

The freezing point of water is 0o C, and the boiling point is 100o C.
The scale is divided into 100 equal degrees between those two points.
It used to be known as centigrade but was renamed after Swedish astronomer Anders Celsius (1701 – 1744)
Celsius degrees are larger than Fahrenheit degrees.
Kelvin: Used in Chemistry and Physics

Kelvin is the absolute temp scale

Kelvin is an important scale based on a single point (absolute zero) which is given a value of 0 degrees. This is the temperature at which an object would zero thermal energy.
From there on up, the scale increases by degrees that are the same size as Celsius degrees.
Water freezes at 273.15 K, and boils at 373.15 K.

The unit “Kelvin” is named after William Thomson, 1st Baron Kelvin. He was a British mathematical physicist and engineer who was born in Belfast in 1824.

Conversion formulas

[°F] = (°C × 9/5 0 + 32         [°C] = ( °F – 32) × 5/9

[K] =  °C + 273.15                  [°C] =  K – 273.15

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